Closure



Feb. 7, 1933. s. K. SMITH 1,395,804,

CLOSURE Original'F'iled May 24, 1929 J7k'673i07" 577.20% WW W PatentedFeb. 7, 1933 UNITED; STATES PATENT ()FFICE I STANLEY K. SMITH, OEWESTFIELD, MASSACHUSETTS ASSIGNOR TO THE H. B. SMITH GOMI E'ANY, OFWESTFIELD, MASSACHUSETTS A COB EORAEION OF MASSACHUSETTS V CLOSUREOriginal application filed May 24, 1929,

This invention relates to an improvedconstruction ofclosure members andrelated attachmcnts, and particularly relates to cast closures. suitablefor heaters or boilers,

tension which is adapted to permit the convenient movement of theclosure. Thus the sheet metal element may conveniently engage a suitablecontrolling element, such as a pullchain or rod, that is connected toautomatic control mechanism. Preferably the sheet metal element may beformed of comparatively ductile material so that it may be twisted afterthe door or closure is cast to permit the ready connection of thecontrol chain thereto and movement of the door by the chain. Aconstruction of this character permits the provision of inexpensiveextensions for cast elements, which are firmly secured thereto and whichare not liable to be broken or fractured as would be the case were castprojections to be provided, while distortion of the ductileextensionsdue to accidental blows or the like may be readily remedied. 1

Referring to the accompanying drawing,

Fig. 1 is a front elevational view of a portion of a cast door and sheetmetal extension having its end embedded in the same;

Fig. 2 is a similar view showing the manner in which the sheet metalextension may be twisted to meet the requirements of use;

' Fig. 3 is an elevational detail of a portion of a boiler withassociated thermostatic control mechanism and a chain connection betweenthe same and the swinging closure or draft door;

Fig. 4 is a side elevational view of the door showing the connection ofthe same to the control chain; and

Fig. 5 is a section on line 55 of Fig. 2.

In accordance with the present invention,

Serial No. 365,629. Divided and this application filed January 21',

1930; Serial No. 422,382.

thedoor may be formed of cast metal, having a dished formation whichprovides a continuous-marginal flange 48. This door maybe of anysuitable shape and may have one-or more integral extensions 58, each of.whichmay be provided with an opening 57' which is adaptedto engage ahinge pintle and therefore is effective in defining a hinge axis. Thedoor may be provided with an integral internal lug 59 which is joined toitsmargin al flange portions at a corner remote from the hinge-extension58. l Vhen the door or closure 60.iscast, the inner end of a sheet metalelement S may be disposed or embedded within the integral lug 59. Theouter end of this element may be provided with an opening 69;

anditsinner end may have an opening 51 which becomes filled with thecast metal and permits the same firmly to interlock with the embeddedendof the sheet metal element.

As-shownin Fig. 1 thestrip S may initially occupy a position wherein itis disposed entirely in a plane-which is substantially parallel to theend of the-door and at right angles to the axis defined by its hingeextension 58. Since thestrip S is formed of comparatively ductilematerial, it may be twisted tothe desired shape properly to receive acontrol chain. For this purpose the portion of thestrip adjoining thesurface of the door 60 may have abend 63.(Fi9:. 5) so that the end of.the strip is disposed outwardly of the end. of the door, as shown inFig. 2, and this end portion of the strip may be then twisted as desgnated by numeral 54 into a plane which is substantially horizontal, i.e., parallel to] the hinge axis of the door. It is thus evident that theductility of the strip S permits the twisting of the samewhile coldproperly to position the opening 69' at the desired point in, relationto the. door. Fig. 3'illustrates a typical manner of ine stalling aclosure of this character in a boil-' erof the general type disclosed inmy prior copending application referred to above,'the I door 60 beingdisposed below the firebox 61 into the firebox, The exact positionofthis closure maybe determined bythe control ele-T V to afford acontrollable closure for air passing; 1 V

' mostatic control mechanism 64 so that the position of the door isvariedin accordance with the movement imparted thereto by element 49 dueto the action of the control mech anism.

Preferably element 49 extends vthrough opening 69 and carries anabutment member 7 O which may engage the lower face of element S whenthe door is partially opened.v

Since the door is hinged at its upper end, as

shown, the weight of its depending lower portion ordinarily will tend tomaintain the outer end of the element S in engagement with the member 7O.

As shown in Fig. 5 the cast metal ordiQ Y Lnarily will fill the opening51 and the inner end of the strip S accordingly is firmly embedded inand interlocked with the cast material of the door, while its outer endmay be readily positioned as required. Obviously this arrangementpermits the sheet metal section to be disposed to receive the imposedstrains advantageously and to locate its chain-engaging portion at oneside of the end of door 60, while accidentaltwisting or bending oftheelement S due toshocks or acci-' dental blows will not be likely tocause its breakage or loosening; and if it is distorted from its propershape, it may bereadily bent and returned to this shape. While the door60 is here shown as an ashpit door, it is inintegral with the marginalflange at the edgev ternal lug projecting from the body portion ofthedoor and its flange, said lug being of the door opposite said extension,and a controlelement of ductile strap material having its inner endembedded in the metal of the lug and its outer end projecting from thedoor, the inner end ofthe-control element being disposed in a planesubstantially at right angles to the direction of extent of said hingeaxis, the element having an intermediate twisted portion disposedadjoining the surface of the door, and having its outer end disposed ina plane which is substantially parallel to said hinge axis, the outerendlof the element being shaped for con-: 1160131011 with 'a controlmember to swing the door about its hinge axis whereby the'eme bedded;portion of the control element is dis-1" posed with its maximumdimension positioned in the direction of a normal strain imposed thereonby the control'member to a swing the door about its hingeaxis;

' 2 A door having a substantially rectangular cast body portion withadish formation providing an integral marginal flange, extensions of saidflange upon one side of the door defining a hinge axis about which thedoor may swing, an integral lug in the, cor: ner of .the closure, saidlug being integral with portions of the flange extending respectively-atright angles to the flange adjoining the hinge axis and opposite saidbedded in the metal of the lug and having an opening through which themetal of the lug extends, said element having its inner end flange, anda metal control element of duca I tile strap metal having its inner endem- 7 disposed in a plane substantiallyv at right angles to the hingeaxis, having a twisted intermediate portion and having its outer portiondisposed in a plane substantially parallel to the hinge axis, said outerportion-having an opening for connection to a flexible the door aboutits hinge axis.

Signed by me at Westfield, Massachusetts, this 31st day ofDecember,L929. 7

STANLEY K. SMITH.

control member adapted to be pulled to swing rzo

